The correct option is(A): MgCO3
Thermal stability order
\({K_2CO_3 > Na_3CO_3 > Ca CO_3 >MgCO_3}\)
Therefore \({MgCO_3}\) releases \({CO_2}\) most easily
\({MgCO_3 ->[\Delta] MgO + CO_2}\)
Ion having highest hydration enthalpy among the given alkaline earth metal ions is:
A bob of heavy mass \(m\) is suspended by a light string of length \(l\). The bob is given a horizontal velocity \(v_0\) as shown in figure. If the string gets slack at some point P making an angle \( \theta \) from the horizontal, the ratio of the speed \(v\) of the bob at point P to its initial speed \(v_0\) is :